Grinding machine



Aug. 9, 1949. G. w. BINNS ET AL GRINDING MACHINE Filed March 12, 1947 7Sheets-Sheet 3 xxx ii I m auanwwnqsh 4..

I III I I INVENTORS 650565 w B/N/VS By FFEJfF/CA 5' 1607/45 1949- G. w.BINNS ET AL 2,478,562

GRINDING MACHINE Filed March 12, 1947 7 Sheets-Sheet 4 INVENTORS 650264-M BIN/v.5 y fPfPEF/C'K 5/1 6045 flTTOF/VEYS Aug. 9, 1949. G. w. BINNSETAL 78,56

GRINDING MACHINE Filed March 12, 1947 7 Sheets-Sheet 6 HTTOEA/EYSPatented Au 9,1949v GRINDING MACHINE George W. Binns, Cincinnati, andFrederick S.

Haas, Orgonia, Ohio, assignors to The Cincinnati Milling Machine 00.,Cincinnati, Ohio, a

corporation of Ohio Application March 12, 1947, Serial No. 734,080

33 Claims. 1

The invention relates to improvements in grinding machines and hasparticular reference to machines for the production of surfaces ofrevolution.

One of the objects of the present invention is the provision of agrinding machine particularly adapted for generation of externalsurfaces of revolution.

A further object of the present invention is. the provision of a machineof this character having interrelated parts constructed and arranged toeffect an automatic continuous cycle production of duplicate workpieces.

Another object is the provision of a machine in which the formed surfaceof revolution shall be in predetermined relation to a. preformedterminal portion of the work.

An additional object of the invention is the provision of a machinewhich will effect automatic accurate positioning of successive workpieces for corresponding action of the grinding wheel with respectthereto.

Another object of the invention is the provision of a simplifiedstructure adapted for use in connection with various grinding machinesbut especially in connection with machines of the type hereinillustrated vand described which will facilitate the accurate varying ofthe height or relationship of the work axis to the grinding wheel axiswithout disturbing the rigidity of mounting or the relationship of theother elements of the machine.

The invention further contemplates the provision of simplified means foraccurately effecting the multiplicity of adjustments essential forprecision production of work accurate to a fractional part of .0001".

Other objects and advantages of the present invention should be readilyapparent by reference to the following specification, considered inFigure 9 is a similar view illustrating the position occupied by theparts operation Figure 10 is a fragmentary front elevation illustratingthe automatic work clamping mechamsm.

during. the loading Figure 11 is a horizontal section as on the lineii-ii of Figure 3.

Figure 12 is a fragmentary View of the compensator portion of the workclamping mechanism.

Figure 13 is a diagrammatic view of the hydraulic circuit and controlstherefor.

Figure 14 is a diagram of the electrical 'con-- trols for cyclicoperation of the machine. and

Figure 15 is a fragmentary sectional view as on the line I5i5 of Figure2.

In the drawings inwhich similar characters of reference are employed todenote corresponding parts throughout the several views, the numeral 20designates the 'base or bed of the maconjunction with theaccompanyingdrawings forming a part thereof and it is to be understood that anymodifications may be made in the exact structural details there shown,and described, within the scope of the appended claims, withoutdeparting from or exceeding the spirit of the invention.

Figure 1 represents a plan view of a machine constructed in accordancewith and embodying the principles of this invention. 4

Figure 2 represents a transverse vertical sec-' tional view taken as onthe line 2 -22 of Figure 1. Figure 3 is a. longitudinal verticalsectional view as on the line 3-3 of Figure 1.

chine which is of conventional hollowor ribbed form.

Rising from the bed is a platform 2! on which is rigidly mounted thegrinding wheel base 22 having a trunnion 23 oscillatablysupporting theswinging grinding wheel unit 24. This unit, as' indicated in Figure 1,includes the'spindle'25 for grinding wheel 26 and a motor unit 21operatively connected with the spindle 25 as by the series of drivingbelts 2 8.

The bed is further provided in subtending relation to the forwardportion of the grinding wheel unit withyvertical ways as at 29' formedon ther'ib 30.- Rib 30 is additionally slotted as at 3| to receive guideblock 32 oscillatably supported in the slot by trunnion 33. I Asubstantially L-shaped intermediate bed plate 34 has an elongated narrowportion which extends lengthwise of the bed 20 and has a surface or way35 interengaged with one, of the ways 29, being held incloseinterfitting engagement therewithas by the adjustable taper gib 36engaging the way onthe opposite/face of the rib and locked to the member34 as by the adjusting screw 31.

At the left hand portion of the machine, as viewed in Figures 1 and 3,the supplemental bed portion is of increased width as indicated at 38and provides a support for the work supplying, holding, and drivingmechanisms as hereinafter described.

By reference particularly to Figures 2 and '7 it will be noted thatextending transversely of the main bed unit 20 is a shaft 39 rotatablyjour-b that this rotary adjustment of shaft 39 by varying the positionof cam portions 42 and 43 will correspondingly raise or lower the uppereffective surfaces 48 and 49 of the discs 44 and 45. Disc 44 extendsupwardly through slot 50 in auxiliary guide rib 5|, and disc 45correspondingly extends upward through slot 52 in the main guide rib 30for the supplemental bed. Rotary adjustment of shaft 39 by raising orlowering of discs 44 and 45 will effect corresponding movement of thewidened portion 36 of the supplemental bed unit riding thereon, the unitas an entirety oscillating about the supporting trunnion 33.

In order that the supplemental bed unit and parts carried thereby may belongitudinally adjusted on the bed, and therefore with respect to thegrinding wheel 26, member 32 is threaded to receive adjusting screw 53whose outer end is swiveled in plate 54 carried by the right hand end ofthe supplemental bed. Secured on the projecting portion 55 is a cuppedplate 56 provided with an actuating handle 51 for rotation of the plateand adjusting screw. This cup is formed with the internal gear 58 withwhich meshes pinion 59 on adjusting screw 60 which extendslongitudinally of the bed and has mounted on its opposite end theadjusting hand wheel 6|. By this construction the longitudinal movementof the supplemental bed with respect to the main bed may be effected bythe operator from either the right or left hand end of the machine.

It will be apparent that the present machine is primarily intended forplunge cut or infeed grinding, that is to say, operations in which thegrinding or stock removal is eifected by relative shifting of the workand grinding wheel in a direction one toward the other as distinguishedfrom intermittent relative advance of the parts with additional relativetraverse as in the production of long cylindrical or like surfaces. Itwill be understood, however, that the principles of the invention ashereinafter described are equally applicable to machines employing notonly infeed but also relative traverse of work and grinding wheel duringthe machining operation. In the form chosen for purposes ofillustration, means have been provided for insuring absolutely accuratepositioning of the work for performance of the grinding operation andadditional means for shifting the wheel in a direction toward the workfor performance of the grinding operation.

In this embodiment, the mechanism for adjust-- ment of the supplementalbed is therefor em ployed only for the accurate setting up orpositioning of the work although it will be understood that it could beadditionally employed for effecting the relative feeding movementbetween work and grinding wheel if so desired.

It is to be particularly noted that the supplemental bed or table memberis fully guided by the interengagement of the ways on the underside ofthe member with the rib of the bed to prevent any movement of the partsso that the table is shiftable in a direct linear direction on the bed.It will further be noted that the arrangement of the parts is such thatadjustment of the eccentrically supported rollers 45 effects an upwardtilting movement of the table member for effecting a raising or loweringof the work piece supports, and thus the work piece with respect to theperiphery of the grinding wheel for varying the radial contact positionof the work with the grinding wheel. When so adjusted by the members 45,the longitudinal shifting of the table member 34 will be substantiallyalong this radial line and at an angle to the horizontal plane of thebed, thus maintaining the relative relationship of the operative face ofthe grinding wheel and the work piece for different longitudinaladjustments of the table.

Work positioning mechanism The present machine is particularly adaptedfor the performance of grinding operations in accordance with theprinciples disclosed in pending application, Serial No. 662,191. Beingintended for the production of work of a high degree of accuracy, it isessential that the work supporting device be capable of minute accurateadjustments in a multiplicity of directions, and at the same time with asimplification of parts, facilitating manufacture and reducing to aminimum the possible error introducible by employment of unduemultiplicity of slides. In attainment of this result, the Portion 36 isprovided with an arcuate T slot as at 62 to receive the head of theguide and locking stud 63 mounted in slide block 64 adjustably fittingwithin recess 65 of the work unit bed plate 66.

The bed plate is further provided with a pivot stud 61 interfitting withguide block 68 slidable in recess 69 of the bed plate unit 66.

By reference to Figure 2 it will be noted that tightening of clamp screw10 will draw stud 61 downward, thus securely locking the block 68 inplace, while loosening of screw 10 will permit of swinging of 66 aboutsaid stud as a pivot. Similarly, tightening of clamp screw H will lockblock 64 and stud 63 in position against arcuate movement as guided by62 while loosening of this clamp will permit the unit 66 to be swung asan entirety about the pivot 61. This angular adjustment makes possible alining up of the work holder mechanism in absolute parallelism of thebase unit 66 with respect to the fixed posi- 3 tion determining members63 and 61 without in any way varying the angular setting which has beenaffected. This is accomplishable in that with the stud 63 locked inposition by screw H, loosening of the nut 12 will free the clampingmaybe moved relative to the locked stud 99 to the extent permittedbyslot 14 and recess 95.

Carried by member 99 is the screw adjusting mechanism 19 shown at theright hand portion of Figure 2, terminating in the screw .16 engagedwith block 68. It will thus be seen that with both the pivot stud 01 andthe T slot stud securely locked in place with respect to the bed v98, alimited adjustment maybe imparted to the bed plate 66.

Mounted upon the bed plate 68 are the work driving and theautomatic-work feeding and holding mechanisms. The work drivingmechanism includes a slide 11 guided for transverse movement by the rib18 and securable in adjusted positions as by the guide and clamp studsI9, a clamp screw 90 being shown and'cooperating with one of the studs19 for clamping thereof. This transverse adjustment is preferablyeffected by a screw 8I swiveled in bracket 92 carried by the slide andin threaded engagement with nut 83 mounted in the bed plate 00. Asuitable pilot wheel 84 facilitates rotation of the screw.

spindle 85 driven as through belts 86 by motor 91.

This spindle has mounted thereon the precision bearing collar 99engaging the face89 of the slide 11 to insure true running of the outerend of the spindle which is provided as with the abrasive cup or workdriving member 90. A truing device 9| mounted on bracket 92 of the workholder is projectable to engage and form accurate terminal surface onthe member 90.

Mounted on the bed plate 09 for adjustment relative thereto as byloosening of the bolt 93 is the bracket 94 to which the member 92 issecured as indicated in Figure 2. This bracket is provided with asegment 95 formed with T slot 96 to receive the bolts 91 and 98 forsecuring at any desired vertically and angularly adjusted position thework engaging shoes 99 and I00 respectively. These shoes are preferablypositioned as described in co-pending application, Serial No. 662,191,so that the angled upper face of the shoe element I00 engages theperipheral portion of the work to be ground at a point closely adjacentthe point of contact of the grinding wheel 26 therewith, while the shoe99 engages the work at the opposite side of its axis from the shoe I00,the two together forming a trough in which the work may be rotated bythe frictional driving engagement of the face of cup 90 therewith andbeing so relatively positioned as to prevent displacement of the work bythe component thrust reactions of the rotary driving member and thegrinding wheel thereagainst. It will be understood that in practice theshoe determined axis of the rotating work piece is displaced in adirection downwardly and toward the grinding wheel as respects the axisof rotation of the driving member so that the driving member will exerta rotary and downward thrust component on' the work, tending to maintainit in engagement with the shoes both prior to and during the grindingoperation.

For automatically successively supplying work .pieces in correspondinggrinding position in themachine and subsequently ejecting the completedwork pieces, the bracket 94 is formed with ways IOI guiding a verticallyreciprocating slide I02 coupled as by rod I09 with actuating piston I04reciprocable in cylinder I05 carried by the'bracket.

The slide I02 has a central slot I08 of width to clably greater.lengththan thediameteroi the workpieces.

At its lower end it is provided with the tra 5 verse angularly disposedcarrier plate I01, providing a carrier. and limiting stop for the workpiece such as I08. It is further provided with a lateral gate or workpiece movement limiting member I09.

The'oper'ation of these parts will be best understood .-by a comparisonof Figures 8 and 9. In Figure 8 the slide is shown in raised position.In this position the laterally extending pin IIO engages collar III onthe spring depressed stop readily adjusted for suitable engagement with]different diameters of work pieces.

In this position of the parts, while the stop member H4 is raised,permitting the innermost of a series of work pieces to move inward bygravity in the trough I I5 secured to the side of bracket 94, the gateI09 extends transversely of the discharge end of the trough, holdingback the innermost work piece. At this time the carrier plate I01 issubstantially aligned with the discharge trough II6 so that the workpiece I08a just completed will roll by gravity from member I01 into thetrough. For convenience of assembly and operation, this trough has beenshown mounted as through the medium of adjusting bolt H1 in suitableposition on the segment 95.

As the plunger or slide I02 is lowered through the intermediate positionshown in Figure 9, the

ward movement of the plunger to the D sitionshown in Figure 3 will placethe carrier plate I01 at a point below the effective work grindingposition as determined by shoes 99 and I00 so that the work will restfreely on these shoes and the carrier plate will be out of engagementtherewith. On reverse movement of the parts, the carrier will again liftthe work piece from the supporting shoes into the position indicated byI08a, Figure 9, so that the work piece can be discharged and uponreverse movement a new work piece will be placed in position. I I Toretain the work during the grinding operation there has been shownpivoted to the member 94 as at II8,'the clamp arm II9 having at itsupper end roller I20 engageable by cam I2I carried by the plunger I02.As the plunger reaches lowermost position, this cam presses roller I20and thus the upper portion of the arm outward, swinging the lowercylindrical portion I 22 thereof inward against the retracting action ofspring I23.

The cylindrical portion I22, as will be best understood by reference toFigures 11 and 12, has

7 slidably keyed therein bushing I24 locked in axially adjustablerelation to the cylindrical portion I22 as by the disc nuts I25.Slidable within this bushing is the member I29 pressed inwardly or inthe direction of work engagingmember 7 by spring I21 whose pressure maybe variably de.

termlned by adjustment of screw I28. Cross pin I29 riding in slots I30of bushing I24 prevent rotation of I25 within I24. Member I26 isbifurcated or slotted as at I3I to receive the threaded stud I32swiveled on pin I29 and bearing the pair of rollers I33 and I34 forengagement with face of a work piece I08 whereby the same is resilientlyheld against member 90 in a manner to permit it automatically to conformto the face thereof.

In order that the clamp device may be readily adapted for use inconnection with different diameters of work pieces, the rollers I33 andI34 may be axially adjusted along stud I32 and secured in said adjustedposition by nuts I35.

It will thus be seen that when the work piece is deposited in positionupon the supporting shoes 99 and I the continued downward movement ofthe work delivering slide will, through cam I2 I, swing arm I I9 toeffect a resilient clamping of the work piece against the work drivingmember.

Conversely, the initial retracting or upward movement of the workdelivery plunger will release the cam pressure, when spring I23 willmove the clamp into disengaging position, leaving the work piece free tobe elevated to the discharge position by engagement of member I01 withthe work, as shown by the dotted line work piece I08a in Figure 8.

The grinding wheel unit In the form of the invention shown for purposesof illustration, the grinding wheel has been indicated as movable in adirection toward and from the accurately positioned work piece forperformance of the grinding operation. While this movement could beeffected by a direct linearly moving slide or the like, it has beenfound preferable for accuracy of performance and cyclic control to mountthe grinding wheel unit 24 on the trunnion 23 which is secured in fixedposition with respect to the bed 20. The unit 24 includes a cylindricalportion I35 providing the hydraulic cylinder I31 in which is slidablymounted piston I38 having a projecting abutment rod I39 at one end and arecess or socket I40 at the other. To facilitate adjustment of thestroke or movement of piston I38, there is preferably provided withinthe cylinder intermediate the piston and cylinder wall a sleeve I4Iwhich may be adjusted axially in a downward direction in the cylinder bymeans of screw I42. This sleeve is provided with the cap I43 havingabutment lug I44 for engagement in the recess I40 of piston I38, theposition of the sleeve and its abutment lug variably limiting the upwardmovement of piston I38. Intermediately connected to I36 is the hydraulicconduit I45 communicating at one end with a control valve I45, and atthe other 'with the interior of the cylinder I31 and by way ofcircumscribing groove I41 and port I48 with the interior of the sleeve.In this manner the reaction of hydraulic pressure between the cylindercap and end of the piston may be variably determined by positioning ofvalve I46, while the projecting abutment lug I44 insures that there willbe at all times an inlet clearance at port I48 between the sleeve capand piston so that the hydraulic pressure may properly react as respectsthe parts.

At its lower end rod I39 engages the rounded anvil 0r abutment lug I49carried by one armof the lever I50 which is of substantially T-shape ordouble bellcrank formation having a lower depending arm II engaging anadjustable abutment I52 carried by piston I53 and a second laterallyextending arm I54 interengaged with the abutment piston I55.

It will be noted that the piston I53 is of relatively large diameter asrespects pistons I38 and I55 and is shiftable toward the right incylinder I55 as by hydraulic pressure introduced through conduit I51.Movement of the piston to the right will correspondingly rock the lowerend of lever arm I5I to a position which may be adjustably limited bythe stop I58 in threaded engagement with bracket I59 on the bed 20 whichhas a terminal abutment portion I60 slidable through bracket I5I andengageable with the face I62 of lever arm I5I. Introduction of pressureinto the chamber I83 of sleeve I4I, due to the relative small diameterof the parts will cause a rapid movement of piston I38 to the positionshown in Figure 7, thus rocking the wheel unit'counterclockwise abouttrunnion 23 moving the wheel in the direction of the work. Subsequentmovement of piston I53 toward the right at a feed rate as determined bythrottle I64 will then cause a slow continued feeding movement which iscontrolled by the resistance of the back pressure or hydraulic springeffect produced by introduction of pressure through conduit I65 intochamber I66 where it reacts on piston I55 urging same upward againstportion I54 of the rock lever.

To limit the amount of this feeding movement or oscillation of the wheelhead unit 24, it is provided with a bore or guiding passage at I61within which is slidably mounted the stop bar I68 keyed against rotationrelative to the bore as by plunger I69. This stop bar has a shoulderedportion or head I10 at its lower end underlying the abutment III of unit22. At its upper end member I68 has an internally threaded bore I12receiving adjusting screw I13 swiveled in cap unit I14 which ma beprovided with graduations as at I15 to denote adjusted position of thestop. A hand wheel I15 facilitates adjustment of the screw and thus ofthe stop position. Formed axially of the adjusting screw and stop barare aligned passages to receive the locking rod I11.

A clamping screw I18 threaded into the upper portion of the adjustingscrew serves to force this rod downward so that its beveled end I19 willreact against face I of lock plunger I8I which, in turn, reacts againstthe lower portion" of the stop guide, positively to lock the guide inits adjusted position.

Machine operation The manner of automatic cyclic operation of themachine will be best understood by reference to diagrammatic views I3and I4, the hydraulic actuating and control devices being particularlyillustrated in Figure 13 and the sequentially functioning electricaldevices and related circuits in Figure 14. As shown in Figure 13, thereis provided a reservoir I82 from which pump I83 is supplied withsuitable hydraulic medium to create a volume of fluid in supply line I84under a pressure determined by relief valve I85. The electrical system,as indicated in Figure 14, may be considered for purposes ofunderstanding of the invention as including the main electrical supplyleads I85 and I81. When the machine is to be operated, stop switch I88is in normally closed position, and starting switch I89 is temporarilyclosed to energize the hydraulic pump control relay I98 maintained incontinuing operation by the controlled switch I9I At the same time, thecontrol relay I92 for the grinding wheel The closing of these switchesalso energizes the conductor I94 extending to the cycle controlmechanisms. This conductor includes a normally closed cyclestop switchI99 and normally opened temporary manually closable cycle start ingswitch I99 Upon closing or the cycle start switch- I99 line I91 tocontroller CRI .for cyclic operation is energized, closing andmaintaining closed the switch er I As a result, the circuit from I99will be maintained closed to I91 by way of I98 after release of thecycle starting switch I99. At the' same time, lead I99 is energized fromI91 while lead 299 is activated through 29l irom'the cycle startingswitch, thus energizing control relay CR2 and closing switches 012 andcr2'-. The closing of switch 012 completes the circuit through 292,energizing control relay CR9 which closes switch or! and also-causesactivation of solenoid 299, which is coupled with valve element 294.When deenergized, spring 299 maintains valve in the position shown inFigure 13in which pressure fluid from I94 may be discharged b wayof thevalve spool 299 and conduit 291- into the lower end of cylinder I99,raising piston I94 and the work controlling slide I92 to the positionshown in Figure 8.

When the solenoid 299 is energized, groove 299 connects conduit 291 withdischarge or reservoir conduit 299 while groove 299 couples pressureconduit I94 with conduit 219 at theupper end of the cylinder, moving thepiston I94 and associated parts into the depressed or work loadingposition shown in Figure 3. In this manner a work piece is automaticallyplaced in position in the machine and there secured by the springpressed clamp rollers I39 and I 94 as previously described. I PlungerI92 is diagrammatically shown as provided with the-switch operating arm2 which, when the plunger reaches its upper end of movement, holds limitswitch LSI in closed position. During, cyclic operation of the machine45 like incident to-employment of ordinary adjusting slides and screw orother actuating mechanisms.

each time that the plunger is raised, if cycle selector switch 29I isclosed, operation of switch 2 II will energize relay CR2 as justdescribed for its energization by closing-of cycle starting switch I99.In either event upon the completion of this circuit a holding circuitfor CR2 is established through the closed side of LS3A and cr2' andconductor 2I-2.

As the plunger moves downward through work loading position arm 2contacts and closes 10 closes and holds" in' closed positiomthe springopenable limit switch LS9. In its open position LS9 through LSIA and01-2 completed the holding circuit from I99 to'2I2 tor CR2, but as LSSA5 is'opened and LSlB is closed, CR2 is deenergized.

opening the holding circuit through 012 for CR9. Alternatively, however,this holding circuit has been completed through LS2, cr4-cr9 and 292 so1 that CR9 and solenoid 299 remain energized.. At 10 the same time,completion of. the circuit through LS9B energizes control relay CR9 foractivation of solenoid 2 I 9.- This solenoid 2I9 is coupled with valve229 normally urged as spring 22I into position to couple conduit I91 byway of 222, groov 223, and return conduit 224 to reservoir.

However, when solenoid 2I9 is energized, this valve will be raised,coupling pressure conduit I94 byway 01' valve groove 229 to conduit 229,and thence through pressure control valve 221 and b variable throttle mto conduitfl91 for introduction of fluid at a throttle determined rateinto cylinder I99. In this position of the parts the lower portion 01'the .valve closes oi! reservoir connection 224 from 222 and thehydraulic actuatin 25' medium 'flows through throttle I94 into cylinderI99. The large'terminal area of the piston facilitates extreme accuratecontrol oi. rate or feeding movement by throttle I94.

The feeding movement of the grinding wheel,

as has been described, is limited by interengagement of stop flange I19with abutment I1I ir respective oi. the ultimate relative movements ofthe actuating pistons and intermediate motion transmitting element I99.After the parts I19 and Ill have been positively interengaged, due

to the greater piston diameter, and thus total eflective pressure withincylinder I59, continued movement of piston I 59 .to the right willforce.pistonl99 up in its cylinder, backing out actu- 40 ating pressurethrough conduit I45.

For-final termination of the grinding operation use is preferably madeof an automatic timing device which may be-set in operation either bylimit switch LS9 or by the additional limit switch LS4, the latterhaving been indicated in diagrammatic view, Figure'14. This limit switchLS4 is carried by the bed 29 in position to be engaged limit switch LS2and through leads 2I9, 2, and as by arm 229 on member 99. Closing ofthis spring 2 I 1. Upon energization of the solenoid the valvemovesydownward, closing off the connection with 299 and couplingpressure conduit I94 with conduit I49 whereby unrestricted pump pressureis introduced into the space I41. As rod I39 is firmly seated againstI49 in its depressed position, as shown in Figure 13, the introductionof this pressure will swing the unit 24 in a counterclockwise directionuntil piston I38 reaches its limit of movement as indicated in Figure'7, this effecting a rapid approach or "rapid traverse" infeed movementof the grinding wheel. Member 24 is provided with the switch actuatingarm or cam 2l9 which, as the unit 24 moves upward,

1 switch completes a circuit from 2I3 by way of 229 and 239 to the tarrytimer relay TRI, which may be of conventional commercial type, eitherhydraulic or electrical, and which, a predetermined period after itsenergization, opens the normally closed switch trI in the lead 2I4 toCR4 controlling solenoid 2l5 for reversal of hydraulic actuatingconditions as respects the piston I38. Upon functioning of the tarrytimer mechanism solenoid M5 is deenergized, when piston valve 2I9 willbe restored to the position shown in Figure 13 by spring 2", couplingconduit I45 to reservoir when the weight of the right hand portion ofunit 24 will oscillate same in a clockwise direction, rapidly retractingthe grinding wheel with respect to the work. This movement releaseslimit switch LS3, opening the holding circuit of CR5 and deenergizingsolenoid 2I9. Spring 22I moves valve 229 to the position shown in Figure13, shutting oil pressure from 229, and

at the same time couples ISL-222 to reservoir through groove 223 andconduit 224. This bypasses throttle I64 so that the rapid movement of 24may continue, reacting through the bellcrank lever l50-to restore pistonI53 to the position shown in Figure 13.

The holding circuit cr2 and 012' having been previously deenergized, asdescribed, the remaining holding circuit for CR3 in effect has beenthrough 2l3, 229 and the series disposed switch elements 013 and 011.Deenergization ,of cr4 by operation ofthe tarry timer switch tr'l alsodeenergizes 229 and CR3, permitting spring 205 to restore the valveelements to the position shown in Figure 13 where the pressure conduitI84 is connected through 201 to the loader cylinder, causing upwardmovement of plunger or slide I02 to work discharging position as shownin Figure 8. As this takes place, LS2 is released and opened while LSIis eventually closed and in the event that cycle selector switch 23l isin closed,

position will reinitiate succeeding cyclic opera-.

tion.

Attention is invited to the fact that, while for clarity of diagrammaticunderstanding of the operation, the elements LSI and LS2 have been shownas disposed respectively above and below the plunger actuating arm 21!,in the actual machine structure, as indicated in Figure 3, theseswitches are disposed on opposite sides of the chamber I05, the plungerpin 232 being contacted by the slide in its upward movement foractuation of LSI and a corresponding plunger 233 being coupled with LS2having a head 234 directly engaged by the arm or flange 2 to exert adownward pull rather than direct push against the switch actuating arm,the principle of operation, however, being identical in the twoinstances.

From the foregoing description it will be evident that there has beenprovided an improved precision grinding machine in which by 'employmentof a multiplicity of fine adjustments the work holding elements may bemost accurately located with respect to a prospective grinding po--sition. Furthermore, that there has been provided an improved manner ofgrinding wheel mounting and hydraulic control for successive rapidadvance and controlled oscillatory'feed movements of the grinding wheelwith respect to the predetermined preset work position, for definitelylimiting the extent of movement of the grinding wheel, maintaining samefor a desired period of time in firmly locked position, not subject tothe creep or inaccuracy potentially inherent in ordinary slide andadjusting mechanisms.

vIt will further be noted that there has been provided an improvedcontrol mechanism for a grinding machine of this character which willinsure the proper rapid continuous cyclic presentation of work pieces inself-stabilized position for grinding within the machine, for effectingthe seou ntial movements of the work presenting and holding mechanisms,and the sequence of operative movements of the grinding wheel withrespect thereto, together with automatic control mechanism for effectinginterlocked, rapid and slow retracting movements of the grinding wheel,removal of a completed work piece and its replacement with a fresh workpiece in continuous consequence.

What is claimed is:

1. An automatic grinding machine of the character described. including awork driving means and a work support means disposed adjacent thereto, arecipr'ocable work shifting device movable to deposit a work piece onthe work supporting means, a work clamping element, means actuable bycontinued unidirectional movement of the work shifting means forefiecting the clamping of the work piece against the work driving means,a'work grinding element movable in a direction toward and from the worksupporting means, means actuable by the said unidirectional movement ofthe work loading means for efiecting sequential rapid and feedingmovements of the grinding wheel in the direction of the work supportingmeans for operation on a workpiece carried thereby, means for limitingthe extent of feeding movement of the grinding wheel, a timedelayreverse for effecting subsequent retraction of the grinding wheel,and means actuable on retracting movement of the grinding wheel forefiecting a reverse shifting of the work loading means to retract anddischarge a completed work piece.

2. In a grinding machine Qof the character described, the combinationwith a bed or support, of a grinding wheel carrier oscillatably mountedthereon, a trunnion remotely supported b the bed at one side of thegrinding wheel, a table having a portion pivotally supported by thetrunnion at one side of the grinding wheel, said table having a worksupporting portion projecting to the opposite side of the grindingwheel, a work support carried by the projecting portion in opposition tothe adjacent portion of the grinding wheel, and means carried by the bedand subtending the work support for determining the position of thetable with respect to the bed.

wheel, means carried by the bed and subtending the work support fordetermining the position of the table with respect to the bed, and meansfor adjusting the supporting means to shift the table about its trunnionand variably position the work support with respect to the grindingwheel.

4. In a grinding machine of the character described, the combinationwith a bed or support, of a grinding wheel carrier oscillatably mountedthereon, a trunnion remotely supported by the bed at one side of thegrinding wheel, a table having a portion pivotally supported by thetrunnion at one side of the grinding wheel, said table having a worksupportin portion projecting to the opposite side of the grinding wheel,a work support carried by the projecting portion in opposition to theadjacent portion of the grinding wheel, means carried by the bed andsubtending the work support for determining the position of the tablewith respect to the bed, said table supporting means being in the formof rollers, and means to longitudinally adjust the table on the rollersto vary the separation between the work support and the grinding wheel.

5. In a grinding machine of the character described, the combinationwith a bed or support, of a grinding wheel carrier oscillatably mountedthereon, a trunnion remotely supported by the guano:

bed at one side of the grinding wheel, a table having a portionpivotally supported by the trunnion at one side of the grinding wheel,said table-having a work supporting portion projecting to the oppositeside of the grinding wheel, a work support carried by the projectingportion in opposition to the adjacent portion of the grinding wheel,means carried by the bed and subtending the work support for determiningthe position of the table with respect to the bed, said supporting meansincluding a transverse, shaft having eccentrics thereon, supportingrollers journaled on the-eccentrics and in engagement with the tablewhereby rotation of the shaft will vary the elevation of the rollers andthus the I angular relationship between the bed and table,

and means for longitudinally adjusting the table with respect to the bedto vary the separation between the work support and grinding wheel,whereby the rollers will provide anti-friction supports facilitatingsaid longitudinal adjustment of the table. j

v 6. In a grinding machin of the character deincluding a small diameterpiston associated with scribed; the combination with a bed or support, I

of a grinding wheel carrier oscillatably mounted thereon, a trunnionremotely supported by the bed at one side of the grinding wheel a tablehaving -a portion pivotally supported by the trunnion at one side of thegrinding wheel, said table having a work supporting portion projectingto the opposite side of. the grinding wheel, a work support carried bythe projecting portion in opposition to the adjacent portion of thegrinding wheel, means carried by the bed and subtending the work supportfor determining the position of the table with respect to the bed, saidsupporting means including a transverse shaft having eccentrics thereon,supporting rollers journaled on the eccentrics and in engagement with thtable whereby rotation of the shaft will vary the elevaship between thebed and table, means for longitudinally adjusting the table with respectto the bed to vary the separation between the work support and grindingwheel, whereby the rollers will provide anti-friction supportsfacilitating said longitudinal adjustment of the table; said projectingportion of the table having a portion thereof formed to provide anarcuate guideway, a pivot carried by the table and disposed concentricwith the guideway, means interconnecting the pivot and work support; andadditional means on the work supportengaging the guideway for securingthe work support in desired angularly adjusted position about the pivotwith respect to the adjacent operative portion f the grinding wheelcarried by the bed.

40 tion of therollers and thus the angular relation- '7. A grindingmachine of the character de- I scribed, including a bed, a work supportadjustably mounted thereon, a trunnion carried by the bed, a grindingwheel pivotally mounted on the trunnion for oscillation in a directiontoward and from the work support, means for effecting a controlled rapidapproach and subsequent feeding movement of the grinding wheel towardthe work support including a power transmittin element, a hydraulicpiston and cylinder mechanism including a small diameter pistonassociated with the oscillatable grinding wheel carriage and actingagainst the element whereby on hydraulic actuation thereof a rapidrelative movement between carriage and power transmitting element willbe effected, a second large diameter piston reacting against the powerelement for effecting joint movement of the element and first-men- 14 vI tioned piston, a hydraulic resistor for said movement, and means forvariably determining thethe oscillatable grinding wheel carriage andacting against the element whereby on'hydraulic actuation thereof arapid relatiye movement between carriageand power transmitting elementJoint movement of the element and first-mentioned piston, a hydraulicresistor for said movement, means for variably, determining thevolumetric reaction of a hydraulic medium as respects the large pistonto determine the rate'ot feed imparted thereby, and meansifor variablylimiting the amount of oscillatory "movement impartable to the carriagwhereby additional movement of the large piston will be absorbed by willbe eflected, a second large diameter piston I reacting against the powerelement for 'eflecting yielding of'the smaller piston andthe-oscillatory in unyielding position for accurate sparking-outoperations.

9. In an automatic grinding machine of the character described,including a work support and an opposed grinding wheel support, agrinding wheel carried thereby a loader mechanismfor positioning a workpiece in the operativ position on the work support, means actuable by'the loader for clamping the work in. operative position, a first meansfor efiecting movement of the grinding wheel toward the work support, asecond means for effecting corresponding feeding movement at a slowerrate, means actuable by the continued movement of the work loadingdevice for initiating operation of the first grinding wheel movingmeans, additional means actuable on movement of the grinding wheel intoprescribed position for initiating actuation of the second grindingwheel moving means, means for positively limiting the extent of movementof the grinding wheel, and distinct means actuable by movement of thegrinding wheel feeding means independent of the positioning of thegrinding wheel for effecting a reversal of the tion thereof.

10. Inan automatic grinding machine of character described, including awork support and an opposed grinding wheel support, a grinding wheelcarried thereby a loader mechanism for positioning a work piece in theoperative position on the work support, means actuable by the poweractua-' the grinding wheel-carriage will be positively locked loader forclamping the work in operative position, a first means for effectingmovement of the grinding wheel toward the work support, a sec- 0nd meansfor efiecting corresponding feeding movement at a slowen rate, meansactuable by the continued movement of the work loading device forinitiating operation of the first grinding wheel moving means,additional means actuable on movement of the grinding wheel intoprescribed position for initiating actuation of the second grindingwheel moving means, means for positively limiting the extent of movementof the grinding wheel, distinct means actuable by movement of thgrinding wheel feeding means independent of the positioning of thegrinding wheel for efiectlng a reversal of the power actuation thereof,and means independent of the reversal controlling mechanism for variablydetermining the limit of power movement of the grinding wheel in afeeding direction.

11. In an automatic grinding machine of the character described,including a work support and an opposed grinding wheel support, agrinding wheel carried thereby a loader mechanism for positioning a workpiece in the operative position on the work support, means actuable bythe loader for clamping the work in operative position, a first meansfor effecting movement of the grinding wheel toward the work support, "asecond means for efiecting corresponding feeding movement at a slowerrate, means actuable by the continued movement of the work loadingdevice for initiating operation of the first grinding wheel movingmeans, additional means actuable on movement of the grinding wheel intoprescribed position for initiating actuation of the second grindingwheel moving means, means for positively limiting the extent of movementof the grinding wheel, distinct means actuable by movement of thegrinding wheel feeding means independent of the positioning of thegrinding wheel for effecting a reversal of the power actuation thereof,means operable on reversal of grinding wheel movement for effecting asubsequent reversal lOf movement of the work feeding mechanism, and acycle control mechanism actuable on retraction of the work feedingmechanism for initiating the subsequent cyclic operation of the parts.

12. A mechanism of the'character described, including a bed or support,a trunnion carried thereby, a grinding wheel carriage pivotally mountedon the trunnion and having its mass disposedto one side of the trunnion,an operating lever pivoted to the bed and having a plurality ofangularly related abutment arms, a first hydraulic motor having anabutment rod engaging one of the arms for actuation of the lever inonedirection about its pivotal support, said first hydraulic motor beingcarried by the grinding wheel carriage and having its abutment shiftablerelative to said carriage, a second hydraulic motor carried by the bedand having a shiftable abutment portion reacting against the lever tooscillate the same about its pivot in a direction opp site to that ofthe first hydraulic motor, whereby actuation of the second motor willthrough the lever and first motor eiiect an augmented movement of thegrinding wheel carriage, a source of hydraulic actuating medium, anda-controlvalve mechanism intervening the source and said hydraulicmotors for eifecting sequential actuation of the respective motors.

13. A mechanism of the character described, including a bed or support,a trunnion carried thereby, a grinding wheel carriage pivotally mountedon the trunnion and having its mass disposed to one side of thetrunnion, an operating lever pivoted to the bed and having a pluralityof angularly related abutment arms, a first hydraulic motor having anabutment rod engaging one of the arms for actuation of the lever in onedirection about its pivotal support, said first hydraulic motor beingcarried by the grinding wheel carriage and having its abutment shiftablerelative to said carriage, a second hydraulic motor carried by the bedand having a shiitable abutment portion reacting against the lever tooscillate the same about its pivot in a direction opposite to that ofthe first hydraulic motor, whereby actuation of the second motor willthrough the lever and first motor effect an augmented movement of thegrinding wheel car riage. a source of hydraulic actuating medium, acontrol valve mechanism intervening the source and said hydraulic motorsfor effecting sequential actuation ,of the respective motors, a thirdhydraulic motor reacting on the lever in opposition to the secondhydraulic motor, and means for coupling hydraulic pressure to said thirdhydraulic motor to impart a continuous unidirectional urge to the lever.

14. A mechanism of the character described, including a bed or support,a trunnion carried thereby, a grinding wheel carriage pivotally mountedon the trunnion and having, its mass disposed to one side of thetrunnion, an operating lever pivoted to the bed and having a pluralityof angularly related abutment arms, a first hydraulic motor having anabutment rod engaging one of the arms for actuation of the lever .in onedirection about its pivotal support, said first hydraulic motor beingcarried by the grinding wheel carriage and having its abutment shiftablerelative to said carriage, a second hydraulic motor carried by the bed'and having a shiftable abutment portion reacting against the lever tooscillate the same about its pivot in a direction opposite to that ofthe first hydraulic motor, whereby actuation of the second motor willthrough the lever and first motor effect an augmented movement of thegrinding wheel carriage, a source of hydraulic actuating medium, acontrol valve mechanism intervening the source and said hydraulic motorsfor eifecting sequential actuation of the respective motors, a thirdhydraulic motor reacting on the lever in opposition to the secondhydraulic motor, and means for coupling hydraulic pressure to said thirdhydraulic motor to impart a continuous unidirectional urge to the lever,said three hydraulic motors being in the form of reciprocable pistons,the combined effective areas of the pistons of the first and thirdhydraulic motors being less than the effective area of the piston of thesecond hydraulic motor whereby when power is applied to the severalmotors the second hydraulic motor will control the direction of movementof the lever.

15. A mechanism of the'character described, including a bed or support,a trunnion carried thereby, a grinding wheel carriage pivotally mountedon the trunnion-and having its mass disposed to one side of thetrunnion, an operating lever pivoted to the bed and having a pluralityof angularly related abutment arms, a first hydraulic motor having anabutment rod engaging one of the arms for actuation of, the lever in onedirection about its pivotal support, said first hydraulic motor beingcarried by the grind.

ing wheel carriage and having its abutment shiftable relative to saidcarriage, a second hydraulic motor carried by the bed and having ashiftable abutment portion reacting against the lever to oscillate thesame about its pivot in a direction opposite to that of the firsthydraulic motor, whereby actuation of the second motor will through thelever and first motor effect an au mented movement of the grinding wheelcarriage, a source of hydraulic actuating medium, a control valvemechanism intervening the source and said 17 hydraulic motors foreffecting sequential actuation of the respective motors; a thirdhydraulic second hydraulic motor, means for coupling hydraulic pressureto said third hydraulic motor to motor reacting onthe lever inopposition to the 1 impart a continuous unidirectional urge to the flever, said three hydraulic motors being in theformof'recip'rocablepistons, the combined eflective areas of the pistons ofthe flrst'and third hydraulic motors being less than the eflective areaof the piston of the second hydraulic motor whereby when power isapplied to the several motors the second hydraulic motor will controlthe direction of movement of the lever, and means independent of thehydraulic motors for limiting the extent of movement of the grindingwheel carriage eflectable by said motors.

direction oi the teed slide. and means carried by piece, means forsequentially positioning a series I of work pieces in operativeposition, in the machine including a bracket adjacent the work supports,,a feeding plunger reciprocably supported by the bracket and having awork piece receiving recess, oppositely angularly disposed loading and Idischarge chutes carried by the bracket and 16.- In a machine of thecharacter described:

the combination with a work driving member, of work positioning membersdisposed adjacent thereto for peripheral engagement with a work piece,means for sequentially positioning a series of, work pieces in operativeposition in the machine including a bracket adjacent the work supports,a feeding plunger reciprocably supported by the bracket and having awork piece receiving recess, oppositely angularly disposed loading anddischarge chutes carried by the bracket and adapted to communicate withsaid recess, anjinclined terminal carrier portion subtending therecessand adaptedwhen in raised position to -ma.gazine whenthe slide israised and the gate substantially coincide with the lower wall of thedischarge magazine and when in depressed position to subtend the workposition as defined by the work supports, said slide having anintermediate gate portion positioned to block on the discharge apertureof the feeding magazine when in raised position and to block off thedischarge magazine when in position to release the'work I piece from thefeeding magazine whereby the released work piece willrollover the gateonto the carrier as the slide is. lowered but may be discharged from thecarrier to the discharge magazine when the slide is-raised and the gate.is in upper work piece restraining position.

17. In a machine or. the character described, the combination with awork driving member, of

work positioning members disposed adjacent" thereto for peripheralengagement with aiwork piece-means for sequentially positioning a seriesof work pieces in operative position in the machine including a bracketadjacent the work supports. a feeding plunger reciprocably supported bythe bracket and having a work piece receiving recess, oppositelyangularly disposed loading and discharge chutes carried by the bracketand adapted to communicate with said recess, an inclined terminalcarrier portion subtending the recess and adapted when in raisedposition to substantially coincide with the lower wall of the dischargemagazine and when in depressed position to subtend the work position asdefined by the work supports, said slide having an intermediate gateportion positioned to block oh the discharge aperture of the feedingmagazine when in raised position and to block 01! the discharge magazinewhen in position to release the work piece from the feeding magazinewhereby the released work piece will roll over the gate onto the carrieras the slide is lowered but may be discharged from the carrier to thedischarge magazine when the slide is raised and the gate is in upperwork piece. restraining position, a spring plunger engageable with workpiece in the feed adapted to communicate with said recess, an in-'clined terminal carrier portion subtendingthe recess and adapted when inraised position to substantially coincide with the lower wall of thedischarge magazinegandiwhen in depressed posi-.

tion to subtend the work position as'defined by the work supports, saidslide having an inter-- mediate gate portion positioned to block of! thedischarge aperture of the feeding magazine when in raised position andto block of! the discharge released work piece will roll over the gateonto the carrier as theslide is lowered but may be discharged from. thecarrier to' the discharge is in upper work piece restraining position, awork ment with a deposited work piece on the work supporting members,and a cam means on the slide positioned to react on the clamping elementsubsequent to deposit of the work piece on the supporting elementsby thecarrier and to disengage th -clamp' on retraction of the. slideprior toreengagement oi the carrier with the work piece.

19; A grinding machine 0! the character described, including a bed orasupport, a grinding wheel carriage mounted thereon, a work supportingtable carried by the support, means for effecting adjustment of thetable in a first transverse plane and in a second vertical plane asrespects the grinding wheel,- a pivot stud carried by th table andadjustable therewith, an arcuate guideway formed on the table and in.concentric relation to the stud, a work supporting unit mounted on thetable having a portion interengaged with the stud and a restrainingmember interengageable with the arcuate way, means for eiIecting aradial adjustment of the unit with respect to the stud and restrainingmember, a work driving means slide mounted on the work supporting unit,means for eifecting transverse adjustment of the slide with respecttothe unit, a work driver carried by the slide, a bracket mounted on theunit and-extending upward in proximity to the work driving member on theslide, work supporting elements mounted on the bracket and adjustablerelative thereto for determining the positioning of a work-piece withrespect to the driving unit, and means for effecting a bodily adjustmentor thebracket and work supporting elements as respects the drivingelement on the slide,

7 20. In a machine of the character described, the combination with abed having longitudinally extending guideways, of a table havingvertical magazine for limiting movement, thereof in the waysinterfltting with the ways o t e b a l9 trunnion carried by the bedintermediate the ways, a guide block oscillatably supported by thetrunnion, said block having guide portions interengaged with the table,adjusting means carried by the bed at a point remote from the trunnionand engaging the table tor variably positioning.

the same about the trunnion} and means for effecting longitudinalmovement of the table with lrespect to the bed along an angular pathdefined by said adjusting means and the trunnioned suporting block. p21; In a machine of the character described, the combination with a bedhaving longitudinally extending guideways, of a table having verticalways interfitting with the ways on the bed, a I trunnion carried by thebed-intermediate the ways, a guide block wcillatably supported by thetrunnion, said block having guide portions inter! engaged with thetable, adjusting means carried by the bed at a point remote from thetrunnion and engaging the table for variably positioning the same aboutthe trunnion, means for eflecting longitudinal movement of the tablewith respect to the bed along an angular path defined by said adjustingmeans and the trunnioned supporting block, a grinding wheel overlying anintermediate portion of the table, and work supporting means mounted onthe table and extending upwardly into opposition to the grinding wheelwhereby longitudinal movement of the table will eiiect adjustment of thework support in an angular direction as respects the opposed grindingwheel.- 22. A machine of the character described including a grindingwheel and opposed work rest means for supporting a workpiece duringaction thereon by the. grindingwheel, a fixed end stopadjacent the workrest means forlimiting the 20 for angularly adjusting the table withrespect to the bed to vary the resultant angle of longitudinaltranslation of the table with respect to the grinding wheel support.

25. A grinding machine including a bed and a grinding wheel supportcarried by the bed, a table member translatably mounted on the bed, worksupporting means carried by the table member for movement toward andfrom the grinding wheel support upon translation of the table, means fordetermining the longitudinal path of translation of the table, andadditional means for angularly adjusting the table with. respect to thebed to vary the resultant angle of longitudinal translation of the tablewith respect to the grinding wheel support, said means for determiningthe longitudinal path of movement of the table 111 eluding verticalguideways formed on the bed and cooperating interiitting guidewaysformed on the underside of the table and interfitting with the ways onthe bed.

26. A grinding machine including a bed and a grinding wheel supportcarried by the bed, a table member translatably mounted on the bed, worksupporting means carried by thetable member for movement toward and fromthe grinding wheel support upon translation of the table, means fordetermining the longitudinal path of translation of the table,additional means for angularly adjusting the table with'respect to thebed to vary the resultant angle of longitudinal translation of the tablewith respect to the grindlongitudinal path of movement of the tableineluding vertical guidewaysiormed on the bed and cooperatinginterfltting guideways formed on the underside of the table andinterfitting with the wayson the bed, and said means for determining theangular path of translation of the table with respect to the bedincluding atrunnioned support carried by the bed for one end of thetable.

27. A grinding machine including a bed and a V grinding wheel supportcarried by the bed, a table eluding a'grinding wheel and opposed workrest means for supporting a work piece during action thereon by thegrinding wheel, a .flxed end stop adjacent the work rest means forlimiting the axial movement of a work piece during a grinding operation,a work loading device reciprocable a work piece in the direction of theend-stop, and

interengageable cam and cam follower means on the end clamp and workloading means for shifting the end clamp in direction to longitudinallymove a work piece on the rest against the fixed I end stop duringcontinued movement of the work loading means in a work depositingdirection.

24.'-A grinding machine including a bed and a' n ing wheelsupportcarried by the .bed,a.tab1e member. translatablymounted on the bed, worksupporting means carried by the-table member for'movementjtoward andfrom the grinding member translatablymounted on the bed, work supportingmeans carried by thetable member for movement toward and from thegrinding wheel support upon translation of the'table, means for.determining the longitudinal path of translation of the table,additional .mea-ns for angula'rly adjusting the. tablewith respect tothe bed to vary theresultant angle of longitudinal trans'lation of thetable with respect to the grinding wheel support, said means fordetermining. the longitudinal path of movement'of the table includingvertical guideways formedon the bed and cooperating interflttingguideways formed on the underside of the table and interfltting' withthe ways on the bed, said means for determining the angular path oftranslation of the table with'respect to the 'bed'including a'trunnionedsupport carried by the bed for one end of the table, and verticallyadjustable supports carried by the bed and engaging a portion of theunderside of the table remote from the trunnion support.

support upon translation of the table, means for determining thelongitudinal path of translation of the table, additional means forangula'rly adlusting the table with respect to the bed to vary theresultant angleof longitudinal translation of the table with respect tothe grinding wheel sup- 28. A grinding machine including a bed and aaavasea path of movement or the table including vertical guidewaysformed on the bed and cooperating interfitting guideways formed on theunderside of the table and interfitting with the ways on the bed, saidmeans for determining the angular path of translation of the table withrespect to the bed including a trunnioned support carried by the bed forone end of the table, and vertically ad- 22 support at one rate. asecond hydraulic motor for effecting corresponding directional movementof the grinding wheel support at a slower rate, valve means farcontrolling the coupling of the actuating medium with the first motor,valve means for coupling ,the actuating medium with the second motor,means actuable by movement of the loader mechanim for shifting the valveto initiate operation of the first hydraulic motor,

justable supports carried by thebed and engaging additional meansactuable on movement of the aportion of the underside of thetable-remote j grinding wheel support into prescribed position from thetrunnion support, said adjustable supfor initiating actuation of thevalve for coupling portsincluding rollers facilitating longitudinal thehydraulic actuating medium to the second translation of the table.motor, means for positively limitingthe extent 29. A grinding machineincluding a bed and of movement of the grinding wheel support, sepaagrinding wheel support carried by the bed, a table member translatablymounted on the bed, work supporting means. carried by the table memberfor movement toward and from the grinding wheel support upon translationor the table, means for determining the longitudinal path of translationof the table, additionabmeans i'or angularly adjusting the table withrespect to the bed to vary the resultant angle of longitudinaltranslation of the table with respect to the grinding wheel support,said means for determining the longitudinal path or movement or thetable including vertical guideways formed on the bed and cooperatinginterfitting guideways formed on the underside of the table andinterfitting with the ways on the bed, said means for determining theangular path of translation of the table with respect to the bedincluding a trunnioned support carried by the bed for one end or thetable, and adjusting means --intervening the table and the trunnionedsupport for eflecting longitudinal translation of the'table in anyangularly adjustable position thereof.

30.- A machine of the character. described, in-

, ratemeans actuable by," movement of the.grind-.

ing wheel support independent of its position for effecting a reversalof the power actuation thereof, and means independent ofethe reversalcontrolling mechanism for variably determining limit 4 e or powermovement of the grinding wheel support 7 in a feed direction;

32. In a grinding machine or the character described, a work support andan opposed grind- 5 ing wheel supportya loader mechanism for posithework support, a valve for controlling the coupling of the hydraulicmediumto said motor,

a solenoid control for the valve, an electric trip 1 mechanism havingaportion disposed in the path of the loading device. whereby movement ofthe'loading device will actuate the trip mechanism to effect solenoiddetermined positioning of the valve to couple the actuating medium withthe first hydraulic-motor, a second hydraulic motorifor'. effectingcontinued movement of thelu a bed, a work suppo an 8- 91 956 1 40grinding wheel support, a-control valve forcougrinding wheel supportcarried by thei'bed; a loader mechanism for positioning'a work 1 piecelin operative position on the .work'fsupport', means;

actuable by the loader mechanism for clamping...

the work inoperative positiomgaffirs't hydraulic motor for effectingmovementg'lof' itheijgrindingwheel in the direction of'-,the*cla'mped.-workrl piece, an electric control operableby'movement asecond hydraulic motor for :efiecting addi j tional movement ofthe"grinding'wheel inthe direction ofthe work, an electric control ior saidsecond'hydraulic motor,- a.-source,of,-hy-

control and initiate movement'oi the second hydraulic'motor', positivemechanical stop means for limiting'the movement of the grindin wheel ina direction or. the work support, electrical stop means activated bymovement of the grinding wheelin the direction of the work support, andmeans to disconnect the power source from the motors when the electricalstop means are actuated. 1

31. In a grinding machine of the character described including a worksupport and an opposed grinding wheel support,'a loader mechanism forpositioning a work piece in operative I .70 other by the movablesupport, means for rigidly position on the work support, work clampingmeans, cam means actuable by. movement of the loader to move'the clampinto workj'eng'aging position, a source of hydraulic actuating medium, afirst hydraulic motor for effecting movement pling hydi'aulic'me'dium tosaid ,motor,-,a. sole .1 I noid1 'for determining theoperative."position,-.oi said-second valve, an electrical tripj. deviceor determinin'githef activation of the solenoid,'i.said Y 'deviceincluding} a 'trip portion engageable .;by

the -grindingi wheelsupport) when the I latter is actuatedzby-the firstmotor to trip the control I g I for movement of the valve to energizethe second of the loader for activating said hydraulicmotor,

'port ir'i'a direction toward the work support, a I

tarry trip actuable by movement or the grinding wheelsupportfandconnectionsbetweenthe tarry trip andthe valve controlling solenoids toefiect. shifting of the valves to disconnect the hydraulic actuatingmedium from said first and second grinding. wheel support actuatinghydraulic motors.

33. In a grinding machine, the combination 60 with a bed, of a worksupport carried thereby,

a grinding wheel supported by the bed, means for eflectlng relativeapproach and retracting movement of the parts including a movable membermounting one of said elements, a hydraulic motor for effecting movementof the element with respect to the bed, and means for determining theextent of such movement including interengaging abutment members, one ofsuch abutment members being carried by the bed and the mounting one' ofsaid abutment members on its supporting-element, the other abutmentmember including a sliding member having an L-shaped portioninterlocking with the fixed abutment,

of the grinding wheel support toward the work screw means for effectinglongitudinal sliding movement of the abutment, said abutment hav- 24REFERENCES CITED The foilowingreferences are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date Booth July 28, 1931 Harrison eta1. Jan. 5, 1932 Booth -1 Mar. 1, 1932 Romaine Apr. 9, 1935 Strong Oct.28, 19%1 Price et a1. M21119, 19 13

